I bought an American Rotary Phase Converter. After "the dust settled," I was out of pocket over $1479. I have not had a chance to use the phase converter. After looking back, I could have bought a new motor and spent much less. I was in contact with American Rotary and they advised against a VFD because of the heavy start-up loading on a compressor motor.
I am not dead yet, so I may find a use for the ARPC yet. ARPC sell a VFD.